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Radiation transducer and method to produce a radiation transducer

a radiation transducer and transducer technology, applied in the direction of conversion screens, fluorescence/phosphorescence, optical radiation measurement, etc., can solve the problems of described light yield impairment and light yield impairment, and achieve the effect of higher light yield and light yield

Inactive Publication Date: 2009-08-20
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]An object of the present invention is to provide a radiation transducer that has a higher light yield. The invention is furthermore based on the object to achieve a method for production of a radiation transducer with a higher light yield.

Problems solved by technology

Due to their content of alkali halogenides, the scintillator materials are at least slightly hygroscopic and must be sufficiently protected from damaging environmental influences (humidity excessively high temperature).
A “yellowing” of the luminophore layer occurs in the course of this packaging process, which leads to an impairment of the light yield.
This leads to the described impairment of the light yield since the maximum of the emission spectrum of the luminophore layer becomes separated step-by-step from the maximum sensitivity of the detector.

Method used

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Embodiment Construction

[0015]In the radiation transducer according to the invention, the oxidation state of the luminophore layer (scintillator layer) is fixed by the application of the anti-discoloration substance before the additional processing, which essentially forms an encapsulation (packaging) of the scintillator layer. A yellowing of the luminophore layer in the packaging process is very significantly reduced or even entirely prevented. This causes the light yield of the luminophore layer in the radiation transducer according to the invention to be thus significantly higher, by approximately 10 to 15%.

[0016]An additional yellowing during the lifespan of the radiation transducer due to environmental influences (moisture temperature) is also significantly reduced or even entirely prevented by the anti-discoloration substance.

[0017]In an embodiment the inventive method, the oxidation state of the luminophore layer (scintillator layer) is fixed via the application of at least one anti-discoloration su...

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Abstract

A radiation transducer has a luminophore layer applied on a substrate, and at least one anti-discoloration substance is applied on the luminophore layer. In a method to produce a radiation transducer a luminophore layer is applied on a substrate, and at least one anti-discoloration substance is applied on the luminophore layer after the application of the luminophore layer on the substrate.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention concerns a radiation transducer of the type in which a luminophore layer is applied on a substrate. The invention furthermore concerns a method to produce a radiation transducer of this type.[0003]2. Description of the Prior Art[0004]A radiation transducer of the above type is used in a digital x-ray detector (flat panel detector) in combination with an active matrix that is sub-divided into a number of pixel readout units with photodiodes. The incident x-ray radiation is initially converted in the luminophore layer (scintillator layer) of the radiation transducer into visible light that is transducer by the photodiodes into electrical charge and stored with spatial resolution. This conversion, known as an indirect conversion, is described in the article by M. Spahn et al., “Flachbilddetektoren in der Röntgendiagnostik” (“Flat panel detectors in x-ray diagnostics”) in “Der Radiologe 43 (2003)”, Pag...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01T1/20B05D5/06B05D3/06C23C16/44B05D1/18C23C26/00
CPCG01T1/20G21K2004/06G21K4/00
Inventor FUCHS, MANFREDKIRCH, OLIVERWITTMANN, GEORG
Owner SIEMENS HEALTHCARE GMBH
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